/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package common

import (
	"fmt"
	"net"
	"os"

	"github.com/docker/docker/client"
)

const (
	RegistryContainerUrlFromDockerSocket = "tcp://localhost:5000"
	RegistryImg                          = "registry"
	registryImgFullTag                   = "docker.io/library/registry:latest"
)

type DockerLocalRegistry struct {
	Connection *client.Client
}

func IsPortAvailable(port string) bool {
	ln, err := net.Listen("tcp", ":"+port)
	defer ln.Close()
	if err != nil {
		_, _ = fmt.Fprintf(os.Stderr, "Can't listen on port %q: %s", port, err)
		return false
	}
	return true
}
